Waste-paper shredder



- Jan. '15 1924.

y c. w. GRIFFIN WASTE PAPER SHHEDDER Filed Sept. 20. 1923 I 2 Shee'ts-Sh'e iz. 1

IN VEN TOR A TT ORNE Y.

Patented Jan. 15, 1924.

CHARLES W. GRIFFIN, OF'RIEGELSVILLE, NEW. JERSEY.

WAS E-P PER SHREDDER.

Application filed September 20, 1923.

To all whom it may concern:

Be it known that 1, CHARLES \V. GRIFFIN, a citizen, of the United States of America, and a resident of Riegelsville, in the county of Warren and State of New Jersey, have invented a new and useful Waste-Paper Shredder, of which the following is a specification.

My invention relates to improvements in machines for cutting or shredding waste material such as paper and rags, and consists essentially of a knife cylinder or head, shaft, and balance-wheel all in one piece, a knife bed provided with a discharge trough, and

certain peculiar blades or knives for said head, together with such other parts and members, in combination with those mentioned above, as maybe necessary or desirable in order to render the machine complete and serviceable in every respect, all as hereinafter set forth.

The primary object of my invention is to produce a small, compact, strong, an d durable machine which iscapable of efficiently shredding waste material, and more especially waste paper for use as packing.

Another object is to. provide such a ma-. chine with reversible knives for the revolving head, and means whereby such knives can be readily attached to and detached from said head and reversed thereon.

A further object is to furnish the machine with a bed having an integraltrough which renders it unnecessary to provide an apron or other separate device for removing the cut material from beneath or within the machine, inasmuch as said bed prevents the stock from dropping down under the knives, and also supports said stock so near the revolving knives that they throwit out of the;

Serial No. 663,832.

feed roll and the supporting terminal of one of'the arms that carry said roll; Fig.3, a vertical, longitudinal section through the upperpart of said shredder; Fig.4,a ife duced top'plan of the bed, and, Fig. 5, a side elevation of the knife cylinder or cut ting head and integral trunnions and. en.- largements. V

Similar reference characters designate, similar parts throughout the several views.

The shredder comprises, a frame 1 of. any suitable or approved construction, and a superimposed bed 2 and pair of brackets3. Journaled in suitable bearings in the lower part of the frame 1 is a transverse shaft 4', and secured to said shaft, at opposite ends outside of said frame, are pulleys 5' and 6 respectively, the former being larger than the latter. The brackets 3 are bolted at 7' to the top of the frame adjacent to the rear edge th ereof, said brackets extending rearwardly and upwardly to forn' be arings at their free ends for a transverse shaft 8. Secured to the shaft 8,.at opposite ends thereof and outside of the brackets 3, are a sprocketwheel 9 and a pulley 10, respectively. A

belt 11 connects the pulley 6 with the pulley 10. A feed boX 12 has a pair of lugs 13 bolted to the under side thereof, which'lugs are loosely. mounted on the shaft 8 insideof the brackets 3. The box 12 eXtend's forwardly above the rear portion of the bed 2,

and rests'by gravity on a bed-knife 26 adjacent to the front edge thereof. Also loosely mounted on the shaft8, between the brackets 3 and the lugs 13, are two forwardly-extending and upwardly-inclining arms 141 which afford bearings at their front terminals for a feed-roll shaft 15. Secured to the shaft 15 are a feed-roll 16 and a sprocket wheel 17..

The sprocket-wheel 1'7 is outside of the feed box and in front of the sprocket-Whee'l-Q,

and a sprocket-chain 18 connects 'said' sprocket-wheels.

The feed-roll 16 is provided at each'end with a disc-or annular flange 19, and its teeth or feeding members are in the form of a series of ribs 20. -The ribs-20 extendbetween the 'flanges 19, and are equidistant apart and parallel with the axis of the feedroll 16. The length of the feed-roll is ap proximately equal to the width of the feed box 12 between the sides thereof and said 7 feederoll normally is locate tl by'the arms 14 with the lower portion of-the roll between said sides. The forward terminal portions of the sides of the box 12 are cut down to receive on the upper edges thereof hubs which extend inwardly from the arms 1d at their forward ends, it being such hubs that form the bearings for the shaft 15. Sue of the aforesaid hubs is shown in full lines in Fig. 2, and indicated by dotted lines in Fig. 3 at- 21. The feed-roll is supported by the means and in the manner just described with the ribs 20 out of contact with the bottom of the feed box.

The parts and members thus far described are generally or in the main old and well known.

The bed 2 has outwardly-extending lugs 22--22 on each side thereof, and each of said lugs is bolted at 23 to the top of the frame 1. Extending across the bed 2 at the rear end is a raised partor flange 2a, and for ward of such part is a horizontal support 25 for the bed-knife 26. The bed 2 is hollowed out between the sides thereof in front of the support 25 to form a trough, the sides of said trough being vertical and parallel, and the bottom of said trough curving downwardly from said support to form a concave part 52, and extending forwardly and downwardly from said curved part toform a tangential, straight, and unbroken part 53 having a downward pitch. Extending laterally from the sides of the bed ,2 are two bearings 27. A hearing cap 28 is provided for each ofv the bearings 27, and

is adapted to be bolted thereto at 2929.

The bed 2, including the lugs 22, flange '24, support 25, trough (52 and 53), and

bearings 27, is all made in one piece, which renders the same comparatively inexpensive and easy to assemble with the other parts of the machine.

That portion of the bed 2 which. comprises the flange 24 and the support 25 is higher than that portion of said bed which comprises the trough (52 and 53), and both of such portions are above the bot-tom edges of the sides of the bed.

There are two (more or less) vertical slots 30 in the support 25 of the bed 2, and the same number (mo-re or less) of horizontal passages 31 in the flange 2a of said bed. A pair of adjusting set-screws 32 are received in the passages 31, and mounted on said set-screws on opposite sides of the flange 24 are two pairs ofnuts 33. The nuts 33 in the frontpair are received in recesses 34: in the front side of the flange 24, so that said nuts are prevented from turning with the set-screws 32. V

The bed knife 26 is double edged, that is to say, both longitudinal edges thereof are cutting edges, and there are countersunk holes insaid knife to register with the slots 30, one of which holes appears at 35 in Fig. 3. A look bolt 36 passes down through each hole 35 and the slot 30 below to receive a nut 37 beneath the support 25, the head of said bolt'being countersunk in the bed-knife 26. The setscrews 32 are in position to receive against/their inner ends the back edge of the bed-knife 26. By means of the two vertical bolts; (36) and nuts and the set-screws 32 andnuts 33, the bed-knife 26 is secured to the support 25, with the front edge of said knife extending over the front edge of said support in cutting position. It is necessary, of course, to loosen the rear nuts 33 before turning the set-screws 32 for the adjustment of the bed-knife, and to retighten said nuts after such adjustment The nut 37 on each bolt 36 is tightened after the proper adjustment of the bed-knife has been made by, means or through the medium of the set-screws. The heads of the set-screws 32 and the rear-nuts 33 are easily accessible, likewise each nut 37, the latter being, located in the space beneath the support 25 and between the sides of the bed 2, which space opens behind. In order to remove and replace the bed-knife, it is first necessaryto swing the feed box 12 with the feed-roll 16 upwardly on the shaft The bed-knife and adjusting and secur-" ing members therefor are old. 7

Provided to cooperate with the bed-knife 26 are two knives 38 which are secured on The head 39 and the trunnions 40 and 4:3

with their enlargements are all made T in one piece. The trunnions 40 and 43 are received in the bearings 27 and held therein by means of the caps 28 and bolts 29. The trunnion 40 extends outwardly beyond its bearing over the pulley 5,.and a belt 45 connects said trunnion with said pulley.

Gpposite sides of the head 39ers flattened to form parallel beds or supports 4646. for the knives 38, and said headhas a plurality of passages l? formed th rein, which passages open at opposite ends through said supports. 7 eight passages a? arranged in pairs side by side and equidistant apart, the passages in each pair being equidistant from the di- Tn the. present case there are ameter of the head 39 which is at right sages to be countersunk, such bolts being inserted from opposite directions. Each bolt 48 is of sufficient length to pass through the head 39 and one of the knives 38, and to receive a'nut 49 thereon outside of said knife. Each knife 38 has two oppositely-disposed cutting edges, is recessed in its outer side, as at 50, to receive the engaging nuts 49 and locate such nuts in part within the super ficial outer surface of said knife, and has screwed onto the same, said knife is ad-' justed on said bed so that the leading cutting edge of the same, in the direction of rotation of the head 39, just clears the front cutting edge of the bed-knife 26, and said nuts are tightened. Each knife 38 covers the heads of four of the bolts 48, and receives in its recess 50 the nuts 49 on the other four bolts 48.

The curved part 52 of the bottom of the aforesaid trough is concentric with the head 39, and the part 53 of said bottom extends forwardly beneath said head. The bottom parts 52 and 53 are also quite close to the circular path of the leading cutting edges of the knives 38.

After the bed-knife 26 has been placed in position and adjusted. and the knives 38 have been secured to the head 39 in proper positions relative to said bed-knife, the machine is set in motion and operates in the following manner:

The pulley 42. which is driven from a countershaft having a belt (not shown), rotates the trunnion 40 and the head 89, with the knives 38 thereon, in the direction of the associated arrow in Fig. 3, the trunnion 43 and fly-wheel 44 revolving with the other members, said first-named trunnion, through the medium of the belt 45 and the pulley 5, causes the shaft 4 to revolve, said shaft, through the medium of the pulley 6, the belt 11, and the pulley 10, causes the shaft 8 to resolve. and the latter, through the medium of the sprocket-wheel 9, the sprocket-chain 1S. and the sprocket-wheel 17, causes the shaft 15 with the feed-roll 16 to revolve in the direction of the associated arrow. The stock to be cut is placed in the feed box 12. and the feed-roll 16 actuates or moves said stock forwardly out of the front end of said box over the bed-knife 26, where said stock is cut or shredded by the knives 3 on the head 39, which latter is revolved at a sufficiently high rate of speed for the purpose. The stock as it is shredded drops down into the trough (52 and 53) and is swept or carried forward in said trough and out through the front end thereof by the impetus impart-ed thereto by the revolving knives.

Thus the shredded stock is thrown clear of the machlne into any suitable recep taclc which may be provided-to receive the 7 same.

While the head 39 'is revolved at a cons paratively high rate of speed, the feed-roll 16 is revolved'at acomparativelv low rate of speed, as is necessary in a machine of this character. The slow speed of the feed-roll 16 is due to the means introduced for stepping down the transmission between the trunnion 40 to said feed-roll. I

After the cutting edge of either knife 38 becomes dull, said knife is reversed to locate the other cutting edge in operative position, which is a decided advantage, as will be readily understood.

Much saving in expense andlabor result from the integral construction of the head 39, trunnions 40 and 48, enlargement 41, and

fly wheel 44, as in the case of the bed 2, and

such construction is especially desirable and entirely practicable in a small machine.

More or less change in the shape, size, construction, and arrangement of some or all of the parts of this shredder may be made "without departing from the spirit of my invention, or exceeding the scope of what is claimed.

What I claim as my invention, to secure by Letters Patent, is

1. The combination, in a shredder,'with and desire a revoluble knife-head, of a bed-knife support having an open-top and open-end integral trough with its bottom beneath said head, and consisting of a part which is approximately concentric with said head, and of a part which is straight and unbroken, tangential to said first-named part, and has a downward pitch.

2, The combination, in a shredder, with a revoluble knife-head provided with axial supporting members, of a bed-knife support having an open-top and open-end integral trough with its bottom beneath said head, and consisting of a part which is approximately concentric with said, head, and of a part which isstraight and unbroken, tangential to said first-named part, and has a downwardly and forwardly-extending bottom to form an open-top and open-end trough, said bottom consisting of a curved part and of a straight and unbroken part tangential to said curved part, and all of such parts and members being integral.

4. In a shredder, a. bed-knife support having at the rear edge an upstanding flange for adjusting means for the bed-knife, and laterally-extending bearings, and all of such having it'orwardly-extend ng sides and a parts and members being integral. downwardly and iorwardlysxtending bot com to form an open-top and open-end CHARLES W. GRIFFIN. trough, said bottom consisting of a curved Witnes as: v V oart and of a straight unbroken part tangen- JOSEPH H. STEIN,

tial to said curved part, said sides having HARRY S. HUGHES. 

